DatacenterDisk
WD

Ultrastar DC SN655 7.68TB U.2

WUS5EA176ESP7E1
Ultrastar DColtpTLC7.68TBNVMe-PCIe4U.2
$38.35/TB
$294.52
newIn Stock
Updated Mar 25, 2026, 05:51 AM
Buy on Amazon →
Quick Verdict

The WD Ultrastar DC SN655 7.68TB U.2 delivers enterprise NVMe performance at $38.35/TB. Suited to read-intensive cloud workloads and mixed enterprise applications. Verify U.2/U.3 backplane compatibility before ordering.

Specifications

Capacity7.68TB
Form FactorU.2
InterfaceNVMe-PCIe4
Recording TechTLC
Sector Size—
Workload Rating—
DWPD1
TBW14000TB
Warranty5 years
ASINB07R6P78KL

90-Day Price History

$25$74$12303/2304/2906/04
How it compares - 7.68TB NVMe-PCIe4
#1Seagate Nytro 5060 U.2 7.68TB
$21.16/TB
#2WD Ultrastar DC SN655 7.68TB U.2THIS DRIVE
$26.40/TB
#3WD Ultrastar DC SN655 7.68TB U.2THIS DRIVE
$38.35/TB
#4Solidigm D5-P5336 7.68TB NVMe U.2
$125.00/TB
#5Samsung PM9A3 7.68TB U.2 NVMe
$162.76/TB

Compare to similar 7.68TB NVMe-PCIe4 drives

Seagate
Nytro 5060 U.2 7.68TB
$21.16/TB
$162.54
new
Solidigm
D5-P5336 7.68TB NVMe U.2
$125.00/TB
$959.99
new
Samsung
PM9A3 7.68TB U.2 NVMe
$162.76/TB
$1,250.00
new
Samsung
PM9A3 7.68TB U.2 NVMe
$169.14/TB
$1,299.00
new
Seagate
Nytro 5350 7.68TB U.2
$169.14/TB
$1,299.00
new

Frequently Asked Questions

The Ultrastar DC SN655 7.68TB U.2 is designed for mixed enterprise workloads including virtualization, databases and analytics. Rated 1 DWPD endurance.

The Ultrastar DC SN655 7.68TB U.2 uses a U.2 form factor with NVMe-PCIe4 interface. Compatible with servers featuring U.2 or U.3 backplanes including Dell PowerEdge, HPE ProLiant Gen10+, and Supermicro with appropriate NVMe backplane.

1 DWPD means you can write the full 7.68TB capacity 1 time(s) per day over the 5-year warranty period, totaling approximately 14016TB written.

Use Case Scenarios

🗄️
OLTP Database Primary Storage
PostgreSQL, MySQL or Oracle requiring low latency and high IOPS.
✓ Excellent fit
NVMe delivers sub-200μs latency vs 5ms for HDD — a 25x improvement that directly reduces query response times. At 1 DWPD verify your daily write volume stays within endurance limits.
🤖
AI/ML Training & Inference
GPU server loading training datasets or serving inference at high throughput.
✓ Excellent fit
NVMe at 6,900MB/s eliminates storage bottlenecks when loading datasets to GPU memory. At 7.68TB you can store substantial model weights on a single drive.
💾
Bulk Cold Data Archive
Storing large volumes of infrequently accessed data.
✗ Not ideal
At ~$38/TB, NVMe costs 10x more than enterprise HDD for cold data. Unless you need fast retrieval, HDDs or LTO tape are far more cost-effective.

Maintenance & Troubleshooting

Maintenance Checklist

On installUpdate drive firmware
Check manufacturer website for latest firmware. Enterprise SSDs receive updates that fix performance and reliability issues.
On installEnable power loss protection verification
Enterprise NVMe drives have onboard capacitors for power loss protection. Verify in drive logs after first power cycle.
MonthlyCheck SMART/NVMe health attributes
Run nvme smart-log /dev/nvme0 (Linux). Monitor: Media_Errors, Available_Spare, Percentage_Used.
MonthlyMonitor write endurance consumption
Track Percentage_Used SMART attribute. At 80%+ consider planning replacement. At 7.68TB and 1 DWPD you have 14,352,384GB lifetime writes.
QuarterlyReview error logs in server BMC
Check iDRAC, iLO or IPMI logs for NVMe errors, PCIe link speed downgrades, or unexpected resets.

Troubleshooting Guide

Cause: PCIe slot not initialized, missing NVMe driver, BIOS not updated, or U.2 cable issue.
Fix: Check BIOS for NVMe in PCIe enumeration. Update server firmware. Reseat U.2 cable. Verify PCIe bifurcation if using adapter. Test in another slot.